Honeycomb fired body, honeycomb filter, and method for producing honeycomb fired body

Abstract

Provided is a honeycomb fired body in which the pressure loss in the initial state where PM has not accumulated is sufficiently low, the strength is sufficiently high, and the heat capacity is not small. The honeycomb fired body of the present invention is a honeycomb fired body including a plurality of cells in each of which one end is plugged and which serve as channels of exhaust gas, and porous cell partition walls that define the cells, wherein the honeycomb fired body is formed of SiC, the plurality of cells include peripheral cells located at an outermost peripheral region of the honeycomb fired body and inner cells located more inward than the peripheral cells, all the inner cells have the same cross-sectional shape that is a rectangle in a plane perpendicular to the longitudinal direction thereof, each peripheral cell is defined by the cell partition walls and an outer wall forming a periphery of the honeycomb fired body, the cell partition walls in contact with the outer wall each have a thick wall region where the wall thickness gradually increases toward the outer wall, the cross-sectional shape of the peripheral cells in a plane perpendicular to the longitudinal direction thereof is a shape formed by reducing the rectangular cross-sectional shape of the inner cells to obtain a reduced rectangle and chamfering or rounding two corners of the reduced rectangle, the cross-sectional area of each peripheral cell in a plane perpendicular to the longitudinal direction thereof is 60 to 80% of the cross-sectional area of each inner cell in a plane perpendicular to the longitudinal direction thereof, the cell partition walls include inter-peripheral-cell cell partition walls each located between the peripheral cells and inter-inner-cell cell partition walls each located between the inner cells, and the minimum thickness of the inter-peripheral-cell cell partition walls is greater than the thickness of the inter-inner-cell cell partition walls.

Description

TECHNICAL FIELD

[0001] The present invention relates to a honeycomb fired body, a honeycomb filter, and a method for producing the honeycomb fired body.BACKGROUND ART

[0002] Particulates (hereinafter also referred to as PM or soot) such as soot in exhaust gas emitted from internal combustion engines including diesel engines cause damage to the environment and human bodies, which has been a problem. Since exhaust gas contains toxic gas components such as CO, HC, and NOx, there has also been a concern for the influences of the toxic gas components on the environment and human bodies.

[0003] Thus, various filters having honeycomb structures (honeycomb filters) formed of porous ceramic such as cordierite and silicon carbide have been proposed as exhaust gas purifying apparatuses. Such honeycomb filters are connected to internal combustion engines to capture PM in exhaust gas, or to purify toxic gas components such as CO, HC, and NOx in the exhaust gas.

[0004] In addition, in order to improve fu...

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